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ATE343270T1 - MULTI-USER DETECTION IN A MC-CDMA MESSAGE SYSTEM - Google Patents

MULTI-USER DETECTION IN A MC-CDMA MESSAGE SYSTEM

Info

Publication number
ATE343270T1
ATE343270T1 AT01401882T AT01401882T ATE343270T1 AT E343270 T1 ATE343270 T1 AT E343270T1 AT 01401882 T AT01401882 T AT 01401882T AT 01401882 T AT01401882 T AT 01401882T AT E343270 T1 ATE343270 T1 AT E343270T1
Authority
AT
Austria
Prior art keywords
user
symbols
user detection
frequency components
despreading
Prior art date
Application number
AT01401882T
Other languages
German (de)
Inventor
David Mottier
Original Assignee
Mitsubishi Electric Inf Tech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Inf Tech filed Critical Mitsubishi Electric Inf Tech
Application granted granted Critical
Publication of ATE343270T1 publication Critical patent/ATE343270T1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0256—Channel estimation using minimum mean square error criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/021—Estimation of channel covariance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03439—Fixed structures
    • H04L2025/03522—Frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H04L25/0244—Channel estimation channel estimation algorithms using matrix methods with inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03331—Arrangements for the joint estimation of multiple sequences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Radio Relay Systems (AREA)

Abstract

The present invention concerns multi-user detection method of symbols transmitted over a downlink of a multi-carrier code division multiple access telecommunication system, the symbols for a user of the system being spread with a signature over a plurality of carriers, the signal received by a user being decomposed into a plurality of frequency components and said frequency components being despread with said signature. Prior to despreading, said frequency components are equalised by multiplying each of said components with a coefficient, said coefficients taking into account an interference level, after despreading, between the symbols for said user and the symbols for the other users of the system. The present invention concerns also an MC-CDMA receiver implementing such a multi-user detection method. <IMAGE>
AT01401882T 2001-07-13 2001-07-13 MULTI-USER DETECTION IN A MC-CDMA MESSAGE SYSTEM ATE343270T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01401882A EP1276268B1 (en) 2001-07-13 2001-07-13 Multi-user detection in an MC-CDMA telecommunication system

Publications (1)

Publication Number Publication Date
ATE343270T1 true ATE343270T1 (en) 2006-11-15

Family

ID=8182806

Family Applications (1)

Application Number Title Priority Date Filing Date
AT01401882T ATE343270T1 (en) 2001-07-13 2001-07-13 MULTI-USER DETECTION IN A MC-CDMA MESSAGE SYSTEM

Country Status (5)

Country Link
US (1) US7327668B2 (en)
EP (1) EP1276268B1 (en)
JP (1) JP4284037B2 (en)
AT (1) ATE343270T1 (en)
DE (1) DE60123940T2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7042967B2 (en) * 2003-03-03 2006-05-09 Interdigital Technology Corporation Reduced complexity sliding window based equalizer
TW200522623A (en) * 2003-03-03 2005-07-01 Interdigital Tech Corp Reduced complexity sliding window based equalizer
US7480493B1 (en) * 2004-10-29 2009-01-20 Itt Manufacturing Enterprises, Inc. Bit detection using code spectrum transform techniques for interference cancellation
US7593473B2 (en) * 2004-12-01 2009-09-22 Bae Systems Information And Electronic Systems Integration Inc. Tree structured multicarrier multiple access systems
US7715460B2 (en) 2005-04-22 2010-05-11 Interdigital Technology Corporation Hybrid orthogonal frequency division multiple access system and method
KR101329145B1 (en) 2007-10-05 2013-11-21 포항공과대학교 산학협력단 Method of space block coding signal transmission and receive with interactive multiuser detection, and aparatus using the same
EP2226650B1 (en) * 2009-03-04 2011-08-17 Sick Ag Optoelectronic sensor
TWI429207B (en) * 2009-06-21 2014-03-01 Ablaze Wireless Inc Transform domain multi-user detection and interference suppression apparatus for femtocell

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2734953B2 (en) * 1993-12-16 1998-04-02 日本電気株式会社 CDMA receiver
JP2809179B2 (en) * 1996-03-14 1998-10-08 日本電気株式会社 Radio broadcast communication system
US6259730B1 (en) * 1998-11-10 2001-07-10 Lucent Technologies, Inc. Transmit diversity and reception equalization for radio links
JP3764827B2 (en) * 1999-03-01 2006-04-12 富士通株式会社 Receiver and reception method in multi-carrier spread spectrum communication
US6721293B1 (en) * 1999-03-10 2004-04-13 Nokia Corporation Unsupervised adaptive chip separation filter for CDMA terminal
US7082174B1 (en) * 2000-07-24 2006-07-25 Qualcomm, Incorporated Method and apparatus for processing a modulated signal using an equalizer and a rake receiver
FR2822568B1 (en) * 2001-03-22 2003-06-06 Mitsubishi Electric Inf Tech GMMSE TYPE EQUALIZATION METHOD AND DEVICE

Also Published As

Publication number Publication date
US7327668B2 (en) 2008-02-05
DE60123940T2 (en) 2007-05-24
DE60123940D1 (en) 2006-11-30
JP4284037B2 (en) 2009-06-24
US20030063557A1 (en) 2003-04-03
EP1276268A1 (en) 2003-01-15
JP2003110530A (en) 2003-04-11
EP1276268B1 (en) 2006-10-18

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